Shulou(Shulou.com)05/31 Report--

This article mainly introduces the factors that affect the master-slave delay of MySQL, which have a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, let the editor take you to understand it.

1. The time that the main library writes to the binary log

Solution:

Control the transaction size of the main database and divide large transactions into multiple small transactions

For example, the update with 100000 lines is modified to 5000 rows and submitted once.

two。 Binary log transfer time

Solution:

Use the MIXED log format

Or set set binlog_row_image=mimimal to reduce the size of binary logs

3. By default, there is only one SQL thread on the slave server, and concurrent modifications on the master server become serial on the slave server.

Solution:

Use multithreaded replication

SQL threads can be allocated in the way of logical clocks in MySQL5.7

How to configure multithreaded replication

Stop slave

Set global slave_parallel_type='logical_clock'; (default database)

Set global slave_parallel_workes=4; (sets the number of replication threads, default is 0)

Start slave

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